Taper angle push and deflection mechanism for electrosparking micro reversed taper hole

Abstract

The invention provides a taper angle push and deflection mechanism for electrosparking a micro reversed taper hole, and belongs to the technical field of micro special type processing. The mechanism is used for electrosparking the micro reversed taper hole on an oil nozzle in the standard of European level IV (national level 4) or above; based on the motion principle of the reverse taper conical surface of a micro electrode wire, the micro reverse taper hole processing can be realized. By the method of fitting an inner conical surface of a deflection shaft sleeve and a convex spherical surface, the peak of the micro taper angle is accurately positioned according to the spherical centre; by arranging an eccentric distance of the upper end of the deflection shaft sleeve, the micro angle is adjusted precisely; by the similar planetary motion of two bearings, the aim of realizing the non-rotating motion of the deflection shaft sleeve by power transmission when the taper angle is deflectedis achieved; and a positioning pin precisely positions a rotary module so that the rotation centre of the rotary module is overlapped with the vertical axis of the spherical centre of the convex spherical surface. When the micro reverse taper hole is processed, the electrode wire moves along a set conical surface under the driving of the deflection shaft sleeve and a guide ceramic tube in addition to axial servo feeding so as to process the reverse taper hole with the set taper angle on a workpiece.

Description

technical field [0001] The invention belongs to the technical field of micro special machining, and in particular relates to a taper angle push-and-swing mechanism for electro-discharge machining of micro inverted taper holes, mainly for the machining of fuel injectors above the Euro IV (National 4) standard. Background technique [0002] Diesel engines are developing towards high performance such as high speed, high injection pressure, and low emissions. The advanced manufacturing technology of key components of diesel engines has attracted much attention. The fuel injector assembly is a key component that affects the performance, life and reliability of the engine. In order to effectively improve the flow coefficient and atomization effect of the fine nozzle hole injection process of the fuel injector, the fine nozzle hole of the diesel engine fuel nozzle not only requires the aperture to be smaller than 0.2mm, but also requires the aperture to gradually decrease along the...

AI Technical Summary

Problems solved by technology

Practice has shown that when the self-rotation of the micro-electrode wire or the guide sleeve realizes the EDM of the inverted taper hole, due to the low stiffness of the micro-electrode wire and the difficulty in controlling the self-rotation accuracy, the machining size and cone angle of the micro-inverted taper hole have large errors, and the rotation Difficult to achieve continuous servo feed of wire electrode to compensate for loss

[0005] Previously filed invention patents [3] The research found that it is difficult to adjust the "inverted cone" cone angle through the gasket, and the apex of the cone angle has uncertainty with the change of the thickness of the gasket, and it is impossible to achieve precise and continuous adjustment of the cone angle

Moreover, if the servo feed of the electrode wire is guaranteed not to rotate, there will be sliding friction between the rotating shaft, the left pad, the right pad and the wire electrode. Friction can cause damaging consequences of "twisting" the electrode wire, making it difficult for industrial applications

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